Single-nucleon knockout cross sections for reactions producing resonance states at or beyond the drip line

R. J. Charity, L. G. Sobotka, and J. A. Tostevin
Phys. Rev. C 102, 044614 – Published 20 October 2020

Abstract

Single-nucleon knockout cross sections from fast secondary beams of the proton-drip-line nuclei C9, O13, and Ne17 on a Be9 target have been studied with emphasis on the production of resonance states. These states were identified by their invariant mass, and resonances with two-, three-, and five-body exit channels were examined. The measured cross sections for these states were compared with eikonal-model predictions using shell-model or variational Monte Carlo spectroscopic factors. The experimental yields were found to be suppressed relative to the model predictions, especially when a well-bound neutron or proton is removed. This suppression exceeds that found systematically in measured inclusive cross sections to particle-bound final states. In neutron knockout from C9 and O13 projectiles, this suppression of the unbound ground-state residuals yield is a factor of two to three times larger than that found in the bound final-state studies. Modifications to the structure of these systems due to coupling of the shell-model configurations to the continuum is expected to contribute to this extra suppression, especially when the final state is a near-threshold resonance. However, other considerations including the role of nuclear dynamics may be required to explain all the observed trends.

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  • Received 16 July 2020
  • Accepted 29 September 2020

DOI:https://doi.org/10.1103/PhysRevC.102.044614

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

R. J. Charity1, L. G. Sobotka1,2, and J. A. Tostevin3

  • 1Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
  • 2Department of Physics, Washington University, St. Louis, Missouri 63130, USA
  • 3Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom

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Issue

Vol. 102, Iss. 4 — October 2020

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